Ermmmm yeah - helps to turn OFF the ADC instead of ON!! The 18F1320 has an ADCON1 bit for each ADC pin, and its 0 for ADC channel i/p and 1 for Digtial o/p.
All is well and my sexy new Optrex Negative blue LCD is working great. Haven't tried the Tianma yet, or the Noritake VFD.
Will update.